The parts that deal with deep doctrinal issues. Ray was a keen student of the Bible, highly intellectual in my view, and he knows the proper applicability of the scriptures as he explains them. He uses a common sense approach where he doesn't take them out of context as the WT has, does, and will continue to do so.
The parts where he's discussing dealings with the GB is very interesting and enlightening. I'm not sure if it was him that mentions it in his book or someone else but the thought of every major appointment, magazine article, assembly talks, and doctrine interpretation, was handled in a very sincere, humble, spiritual way over continual prayer until they felt Jehovah's spirit actually guiding them to mentally decide one way or another. I did not expect the bickering, and politicking that can only be compared to world politics.